Multi-replicator stretcher detector

Abstract

A detector for magnetic bubble domain devices including an input path for receiving and propagating magnetic bubble domains, an expander device which intersects the input path and functions to expand the bubble domain in a first direction, and a replication device which intersects the expander and functions to cut the expanded bubble into a plurality of magnetic bubble domains and to expand the bubble domain in a second direction. A plurality of detector strips are disposed along the second direction functioning to detect the plurality of magnetic bubble domains.

What is claimed is: 
     
       1. A detector for magnetic bubble domain devices comprising: a propagation path comprising a dual conductor propagation track for magnetic bubble domains;   first and second current means connected to said dual conductor propagation track for applying a time varying current thereto;   the current applied to said first conductor track being different in phase than the current applied to said second conductor track so that a magnetic bubble domain is propagated along the dual conductor;   expander means disposed adjacent said propagation path and functioning to expand a bubble domain on said path in a first direction, said expander means comprises a hairpin loop intersecting said propagation path at a substantially right angle;   replication means disposed adjacent said expander means and functioning to cut said expanded bubble into a plurality of magnetic bubble domains and to expand the bubble domains in a second direction different from said first direction;   said replication means comprises a multi-loop conductor track intersecting said expander means at approximately a right angle; and   detection means disposed along said second direction and functioning to detect said plurality of magnetic bubble domains, said detection means being formed by elongated strips of a magnetoresistive sensor element extending essentially parallel to and between the turns of said multi-loop conductor track.   
     
     
       2. A detector as defined in claim 1, further comprising first pulse means for providing a signal pulse to said expander means, said first signal pulse being of a predetermined duration beginning at a first time instant and ending at a second time instant. 
     
     
       3. A detector as defined in claim 2, further comprising second pulse means for providing a first signal pulse of a predetermined duration to said replication means at a third time instant, said third time instant being after said first time instant and before said second time instant. 
     
     
       4. A detector as defined in claim 3, wherein said second pulse means provides a second pulse of opposite polarity to said replication means after said first signal pulse, said second pulse being applied after detection of said bubbles for collapsing said bubbles. 
     
     
       5. A detector as defined in claim 1, wherein said hairpin loop comprises a conductor which makes physical and electrical contact with one of said conductors of said dual conductor track. 
     
     
       6. A detector as defined in claim 1, wherein said hairpin loop is a conductor which is physically and electrically spaced apart from said dual conductor track. 
     
     
       7. A detector for magnetic bubble domain devices comprising: a propagation path for magnetic bubble domains;   expander means disposed adjacent said propagation path and functioning to expand a bubble domain on said path in a first direction;   first pulse means for providing a signal pulse to said expander means, said first signal pulse being of a predetermined duration beginning at a first time instant and ending at a second time instant;   replication means disposed adjacent said expander means and functioning to cut said expanded bubble into a plurality of magnetic bubble domains and to expand the bubble domains in a second direction different from said first direction;   said replication means comprises a multi-loop conductor track intersecting said expander means at approximately a right angle;   second pulse means for providing a first signal pulse of a predetermined duration or said replication means at a third time instant, said third time instant being after said first time instant and before said second time instant; and   detection means disposed along said second direction and functioning to detect said plurality of magnetic bubble domains said detection means being formed by elongated strips of a magnetoresistive sensor element extending essentially parallel to and between the turns of said multi-loop conductor track.   
     
     
       8. A detector as defined in claim 7, wherein said propagation path comprises a dual conductor propagation track. 
     
     
       9. A detector as defined in claim 7, further comprising first and second current means connected to said dual conductor propagation track for applying a time varying current thereto; the current applied to said first conductor track being different in phase than the current applied to said second conductor track so that a magnetic bubble domain is propagated along the dual conductor track. 
     
     
       10. A detector as defined in claim 7, wherein said expander means comprises a hairpin loop intersecting said propagation path at a substantially right angle. 
     
     
       11. A detector as defined in claim 10, wherein said replication means comprises a multi-loop conductor track intersecting said expander means at approximately a right angle. 
     
     
       12. A detector as defined in claim 11, wherein said second pulse means provides a second pulse of opposite polarity to said replication means after said first signal pulse, said second pulse being applied after detection of said bubbles for collapsing said bubbles.